""
''
"foo ""bar"" baz"
'foo ''bar'' baz'
ITALICS_'foobar'
"foo &
	&bar"
"foo &
	! Comment
	&bar"

----------------------------------------------------

[
	["string", ["\"\""]],
	["string", ["''"]],
	["string", ["\"foo \"\"bar\"\" baz\""]],
	["string", ["'foo ''bar'' baz'"]],
	["string", ["ITALICS_'foobar'"]],
	["string", ["\"foo &\r\n\t&bar\""]],
	["string", [
		"\"foo &\r\n\t",
		["comment", "! Comment"],
		"\r\n\t&bar\""
	]]
]

----------------------------------------------------

Checks for strings and line continuation.
Also checks for comments inside strings.